package facade;

/**
 * @author shenhan
 * @create 2020/4/3 16:18
 * @description
 */
public class Stereo {
    private static Stereo instance = new Stereo();

    public static Stereo getInstance() {
        return instance;
    }

    public void on() {
        System.out.println("立体声 打开");
    }

    public void off() {
        System.out.println("立体声 关闭");
    }

    public void up() {
        System.out.println("立体声 上升");
    }

    public void down() {
        System.out.println("立体声 下降");
    }


}
